/* eslint-disable no-redeclare */
function getLocalFilePath(path) {
	if (path.indexOf('_www') === 0 || path.indexOf('_doc') === 0 || path.indexOf('_documents') === 0 || path.indexOf('_downloads') === 0) {
		return path
	}
	if (path.indexOf('file://') === 0) {
		return path
	}
	if (path.indexOf('/storage/emulated/0/') === 0) {
		return path
	}
	if (path.indexOf('/') === 0) {
		var localFilePath = plus.io.convertAbsoluteFileSystem(path)
		if (localFilePath !== path) {
			return localFilePath
		} else {
			path = path.substr(1)
		}
	}
	return '_www/' + path
}

function dataUrlToBase64(str) {
	var array = str.split(',')
	return array[array.length - 1]
}

var index = 0
function getNewFileId() {
	return Date.now() + String(index++)
}

function biggerThan(v1, v2) {
	var v1Array = v1.split('.')
	var v2Array = v2.split('.')
	var update = false
	for (var index = 0; index < v2Array.length; index++) {
		var diff = v1Array[index] - v2Array[index]
		if (diff !== 0) {
			update = diff > 0
			break
		}
	}
	return update
}

export function pathToBase64(path) {
	return new Promise(function (resolve, reject) {
		if (typeof window === 'object' && 'document' in window) {
			if (typeof FileReader === 'function') {
				var xhr = new XMLHttpRequest()
				xhr.open('GET', path, true)
				xhr.responseType = 'blob'
				xhr.onload = function () {
					if (this.status === 200) {
						let fileReader = new FileReader()
						fileReader.onload = function (e) {
							resolve(e.target.result)
						}
						fileReader.onerror = reject
						fileReader.readAsDataURL(this.response)
					}
				}
				xhr.onerror = reject
				xhr.send()
				return
			}
			var canvas = document.createElement('canvas')
			var c2x = canvas.getContext('2d')
			var img = new Image()
			img.onload = function () {
				canvas.width = img.width
				canvas.height = img.height
				c2x.drawImage(img, 0, 0)
				resolve(canvas.toDataURL())
				canvas.height = canvas.width = 0
			}
			img.onerror = reject
			img.src = path
			return
		}
		if (typeof plus === 'object') {
			plus.io.resolveLocalFileSystemURL(
				getLocalFilePath(path),
				function (entry) {
					entry.file(
						function (file) {
							var fileReader = new plus.io.FileReader()
							fileReader.onload = function (data) {
								resolve(data.target.result)
							}
							fileReader.onerror = function (error) {
								reject(error)
							}
							fileReader.readAsDataURL(file)
						},
						function (error) {
							reject(error)
						}
					)
				},
				function (error) {
					reject(error)
				}
			)
			return
		}
		if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
			wx.getFileSystemManager().readFile({
				filePath: path,
				encoding: 'base64',
				success: function (res) {
					resolve('data:image/png;base64,' + res.data)
				},
				fail: function (error) {
					reject(error)
				}
			})
			return
		}
		reject(new Error('not support'))
	})
}

export function base64ToPath(base64) {
	return new Promise(function (resolve, reject) {
		if (typeof window === 'object' && 'document' in window) {
			base64 = base64.split(',')
			var type = base64[0].match(/:(.*?);/)[1]
			var str = atob(base64[1])
			var n = str.length
			var array = new Uint8Array(n)
			while (n--) {
				array[n] = str.charCodeAt(n)
			}
			return resolve((window.URL || window.webkitURL).createObjectURL(new Blob([array], { type: type })))
		}
		var extName = base64.split(',')[0].match(/data\\:\S+\/(\S+);/)
		if (extName) {
			extName = extName[1]
		} else {
			reject(new Error('base64 error'))
		}
		var fileName = getNewFileId() + '.' + extName
		if (typeof plus === 'object') {
			var basePath = '_doc'
			var dirPath = 'uniapp_temp'
			var filePath = basePath + '/' + dirPath + '/' + fileName
			if (!biggerThan(plus.os.name === 'Android' ? '1.9.9.80627' : '1.9.9.80472', plus.runtime.innerVersion)) {
				plus.io.resolveLocalFileSystemURL(
					basePath,
					function (entry) {
						entry.getDirectory(
							dirPath,
							{
								create: true,
								exclusive: false
							},
							function (entry) {
								entry.getFile(
									fileName,
									{
										create: true,
										exclusive: false
									},
									function (entry) {
										entry.createWriter(function (writer) {
											writer.onwrite = function () {
												resolve(filePath)
											}
											writer.onerror = reject
											writer.seek(0)
											writer.writeAsBinary(dataUrlToBase64(base64))
										}, reject)
									},
									reject
								)
							},
							reject
						)
					},
					reject
				)
				return
			}
			var bitmap = new plus.nativeObj.Bitmap(fileName)
			bitmap.loadBase64Data(
				base64,
				function () {
					bitmap.save(
						filePath,
						{},
						function () {
							bitmap.clear()
							resolve(filePath)
						},
						function (error) {
							bitmap.clear()
							reject(error)
						}
					)
				},
				function (error) {
					bitmap.clear()
					reject(error)
				}
			)
			return
		}
		if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
			var filePath = wx.env.USER_DATA_PATH + '/' + fileName
			wx.getFileSystemManager().writeFile({
				filePath: filePath,
				data: dataUrlToBase64(base64),
				encoding: 'base64',
				success: function () {
					resolve(filePath)
				},
				fail: function (error) {
					reject(error)
				}
			})
			return
		}
		reject(new Error('not support'))
	})
}
